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When a VideoFrame is destroyed, this CL causes D3D11VideoDecoder to
wait for the sync token to clear before re-using the associated
PictureBuffer.  This ensures that any use of the underlying texture
is also done.

Bug: 832732
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Icdac2bfd95e8b98ff47a1633426bb50205f05820
Reviewed-on: https://chromium-review.googlesource.com/1012507
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551860}